Water-tube-boiler superheater



B. BROIDO. wma TUBE soma suPeRHE/we.

APPLICATION FILED JUIIIE20, I9I9. h

?aten'te Jan. Z0, 1920.

2 SIIEETS-SHEEI -I UNITED sTATEs PATENT oEEioE.

BENJAMIN BROIDO, 0F NEW' YORK, N. Y., ASSIGNOR TO LOCOMOTIVE SUPERHEATERCOMPANY, OF NEW YORK, N. Y., A CORPORATION 0F DELAWARE.

WATER-TUBE-BOIJER SUPERHEATER.

To all whom z't`may concern:

Iie it known that I, BENJAMIN Bacino, a citizen of Russia, and residentof New York,

in the county of New York and State of' New York, have invented certainnew and useful Improvements in VVater-lube-Boiler Superheaters, ofivhichvthe following is a specification. i

My invention relates to boilers of the water tube type in which thewater tubes are arranged in spaced rows; and has for its purpose the.provision of an improved superheater, the tubular elements of which arelocated in the spaces between the water tubes.

I deem it expedient to describe my invention by showing it as applied totwo differA ent forms of .water tube boilers. The principle involved'will be appreciated from the description ofthese two forms and canreadily be applied to other boilers, having water tubes similarlyspaced. In the drawings lwhichfaccbinpany this specification and f forma part thereof, Figure 1 is a transverse section taken on line 11 ofFig. Q, and Fig. 2 is a longitudinal section taken on line of Fig. 1,illustrating one form of boiler with my invention applied. Fig. 3 is atransverse section on line BH3 of Fig. 1; Fig.v 4. is a centrallongitudinal section of Fig. 3. These two figures show a boiler of yanother form with my invention in place.

Figs. 5 and 6 are views o'n an enlarged scale which will'be found usefulin understanding the principle involved in my invention.

In the form vof the boiler shown in Figs.

1 and 2,' the boiler, which comprises two steamand waterdrums, 1 and 2,the front Water leg 3, the rear water leg 4, and the water tubes 5joining them. is inclosed in the setting 6. The water tubes 5, it willbe noticed, particularly from Fig. 1,. are alined 4and regularly spaced,the arrangement being such` that the tubes lie in horizontal rows butare staggered in the other direction so that there are nofree verticalspaces between tubes, but spaces at an angle to the vertical. Under theforward end of the tubes 5, there 'is located the furnace 7 to whichaccess for firing and for other purposes is gained through openingB. andwhichis limited at its rear by the bridgewall 9. Baillie/s 10 and 11.serve to direct the products of combustion from the furnace over thewater tubes to the stack connection 12. Steam is taken oil from thedrumsil and 2 by means of the Specification o Letters Patent.`

Patented Jan. 20, 1920.

Application filed .Tune 2G, 1919. Serial No. 305,529.

connections 13 and le which deliver it to the common steam pipe 15.

The boiler thus briefly described is of a usual construction and is notmodilied in any particular for the present purposes. Its function maybriefly be stated, as follows:

The boiler having. been filled to the proper level with water, a .hireis built in the furnace, the hot gases from which rise, pass over thefirst portion of the water tubes 5, then go` downward through the spacebetween the two baffles 10 and 11 and finally up through the spacebetween baille and therear portion of the setting and so to the outlet.12. In their passage over the tubes, the gases heat the water withinthe tubes and generate steam which rises principally' through the frontwater leg and is collected in the drums 1 and 2 whence it is taken offby steam pipes 13 and 14.

It has been suggested heretofore to locate the elements of a tubularsupeiheater inthe space between the water tubes. aware, however, of anyarrangement which presents the advantages of the present one. It will beobvious that the path for the steam through the superheater inust be ofsuch size that no appreciable obstruction is presented to the steam flowthrough the superheater. The usual form of superlieaters of -this classcomprises a header or headers to which the ends of tubular elements areattached, the steam being delivered to one of the headers, leavin@ it bymeans of and flowing through the e ements during which passage it issuperlieated, and returning to the other header. If these elements aremade large enough to presentthe requisite space or section for steamflow and are located in the spaces between the vwater tubes. there willbe danger that their I yam not4 presence will seriously obstruct theliow of l the hot gases over the water tubes. If., on the other hand,they are made' small enough so that they do not interfere with this gasiiow, it is impossible by any construction heretofore known tosupplyvenough of them to present an adequate path for the steam flow. Inthe arrangement according ,to niy invention, the two superheater headers1 6 and 17 are placed transversely under the forward water leg. Theupper one of them` 16,. has connected to itlthe pipe 15, while lfrom the.end of the lower one, 17. steam `is taken olf at the point 18.Connected to the meneer as will be seen, are curved and extend into thediagonal spaces between the Water tubes adjacent to the iront Water leg3. They are of a diameter sulistantially equal to the distance betweenthe water tubes so that they practically till this lspace. TWhile theyare shown as being; cylindrical, it is evident they may 'he ot someother shape. A similar series ot sub-headers. 2O7 iS connected with thelower header, 1T, and extends into the same spaces aliljacent to thesub-headersy 19, and parallel to them but on the side away from thewater leg il. The members ot this seeond series, 20, are shorter thanthose of' the series. 19. They may also be ot' sonic other than circularcross-section. The Ipal'- ticular means used to secure these rsubheadersto the main headers 1G and 17 vforms no part ot mv present invention andma)v he of any description desired. l prefer, hou'- Vever, that they beof such a nature that they permit read3y detachment and re-attach nient.Secured to the sub-headers 1 9 and 2() are the U-shaped super-heaterelements 21. @ne end ot each of them is. connected to a sub-header 1l)of a pair ot sub-headers which lie Within the same space. the other endbeing connected to the :nib-hinder E() of the same pair. and the,straighty parallel lengths ot the element extending" plu-alltel to theWater tubes. As appears clearly in Fig. 2, a series of such U-shapedelements 2l connects each pair of sub-headers, the elements being ot'graded sizes a'nd arranged one within the other. The elements Q1 areprelerably fixed to the sub-headers 19 and 2O in a permanent manner,such as results by welding` them to these sub-headers, and tivosub-headers together with their elements 21 constitute what may betermed a single unit. To removesuch a unit, the connection with headern.lb and 17 is broken, atteiivhich the unit can'be lowered into thefurnace space, 7 from L`which it can be removed through. the door 8.

leferringnoiv "for a moment to Figs. 5 and t3, therewill be found herea. more or less diagramlnatic representation of some of the partsjustspoken of, Which Will serve to make oleai'ei-Aone important feature ofmy invention. ln these two figures, the subheaders 19 and 2O are seen tobe of the size mentioned` z'. c. of such size as to extend from one rou'ot' Water tubes to the next one; while the elements Q1 are considerablysmaller in diameter. This principle constitutes ithelnisisl of myinvention. lts advantage is that it permits a large total path for steamflow through the superheater and yet presents a iomparatively smallobstruction to the flow l the gases between the Water tubes. d t the.same time the sub-headers and the connections oi the element-s to themare. out of the direct line et the hot gases, and so less liable toinjury troni this source.,

The function of my device "will be parent from what has been said.Steam7 flelivered to the header 16 by, the pipe l5, conveyed by thisheader to the sub-head-rs 19 Which in turn deliver it to the elementsQ1. `While flowing through these elements,

it is subjected to the heating effect ot the gases from the furnace andis delivered to the sub-headers Q in a. snperheated state. flhesesub-headers deliver itto the lower header 17 from 'the end 18 ot 'whichit is taken ott' and carried to the point ot use.

ln the form of water tube' boiler' illustrated in 3 and el, the'constituent parts of the boiler maT be briefly given, vtollovvs: lVatertubes 5 arranged in regularly spaced rows connect the upper drum 22 withthe loi-ver drum This structure is inclosed in a housing il from theforward side ot which extends the Jfurnace space 7. A baille 2l servesto direct the gases coming `from the -t'urrnice 7 so that they areconstrained to tlovv irst upward over a portion ot the Water tubes .5and then downward through the remainingportion to the stack connection.12.

The sub-headers l19 and 2O of the supefheater are in this case shown asextending into the space betweentubes near-the top ot' these tubes andadjacent to the drnn. The sah-headers 19 are again longer than those ofthe set 2() and the -shaped elements il are permanent-ly connected tosub- -headers 19 and 20 in a manner similar to that previouslydescribed.

rEhe principle emphasized above, by which the elements 21 are smallenough not toobstruct the flow ot gases while the sub-headers 19 and 20are as large as the spacing adnuit-s. again adhered to. Headers 16 and17 area'n this case given a shape, as will be gathered from Fig. 8,loringingv it into close proximity to the side of the housing' b. Steamis delivered to the header 1G in this case by the 'steam pipe 15,leadingfrom the upper portion of the drum 22.

The function of 'theI boiler and my apparatus will be perfectly evidentand requires no further statement. To remove a. vunit made up of a pairof sub-headers 19 and 20, and the attached elements, its connection withheaders 16 and 17 is broken, after which the elementcan be moveddownward the straight parallel lengths of the lJ-shaped ele-l watertubes; or instead of a mere U-sh'aped unit a serpentine form may beemplov ed.- As

long as these variations do not lose t e spirit and underlying principleof ni invention,

they areto be considered as inc uded in the subjoined claims. r`

lVllat l claim is:

l. In a boiler, the combination of two parallelwater legs; water tubesconnecting theni and arranged in spaced rows; a pair of parallelsuperheater headers adjacent to one of the water legs and arrangedtransversely to the water tubes; a sub-header secured to one of theheaders and extending into the space between two rows of water tubes andadjacent to the water leg; a, second sub-header secured to the otherheader and extending into the space on the side of the first away from'the water leg and notI as far as the first; both sub-headers being of adiameter substantially equal to the space between the rows of tubes; anda plurality of tubular superheater elements attached t0 the pair ofsub-headers and extending into the space between the water tubes, theelements being of' xnateraliy smaller diameter than the space.

ln a boiler, the combination ot' a front and a rear water leg; watertubes connecting them and arranged in spaced rows; means to direct a iowof hot gases across the water tubes; a pair of superheater headersadjacent and transverse to the water tubes; a pair of parallel; adjacentsub-headers attached one to each header and extending,r for unequaldistances into the space betweentwo rows of water tubes and out of thedirect path of the gases, each sub-header being of a diametersubstantially .equal to the space between the rows; and superheaterelements, materially smaller in diameter than the sub-headers; rlocatedin the space between the water tubesvand out of contact with ther'n andsecured to the s1b-headers- 3. In a boiler, the combination of a waterleg; twoparallel spaced rows of water tubes secured'to thewater leg; asuperheater subheader in the 'space between the rows and adjacent tothel water leg; a second and shorter sub-header in the space paralleland adjacent to the'lirst on the side remote from the water leg; aplurality of looped superheater elements whose ends are secured to thetwo sub-headers respectively, and which extend into the space betweenthe tubes; and two superheater headers lying outside of and transverselyto the space between the rows of water tubes and to which the subheadersare secured.

4. In a boiler, the combination of a plurality 0I' water tubes arrangedin spaced rows and secured to a water leg; a superheater unit located inthe s ace between two rows comprising a pair o sub-headers extendingsubstantially from one row to the other, and a plurality of elementsconnected to the sub-headers and extending into the space away from thewater leg'and spaced from both rows.

Signed at New York in the county of New York and State of N ew York this19th day of .lune A. D. 1919.

' BENJAMIN BROIDD.

